TWI439024B - Cascade frequency converter and power unit with bypass module thereof - Google Patents
Cascade frequency converter and power unit with bypass module thereof Download PDFInfo
- Publication number
- TWI439024B TWI439024B TW101112024A TW101112024A TWI439024B TW I439024 B TWI439024 B TW I439024B TW 101112024 A TW101112024 A TW 101112024A TW 101112024 A TW101112024 A TW 101112024A TW I439024 B TWI439024 B TW I439024B
- Authority
- TW
- Taiwan
- Prior art keywords
- bypass
- circuit
- module
- power unit
- diode
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0085—Partially controlled bridges
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Description
本發明涉及變頻器技術領域,更具體地,涉及一種級聯型變頻器、功率單元及其旁路模組。The invention relates to the technical field of frequency converters, and more particularly to a cascade type frequency converter, a power unit and a bypass module thereof.
隨著現代電力電子技術和微電子技術的迅猛發展,大功率變頻器不斷地成熟應用起來,特別是在中、高壓器件應用的可靠性還不是太高且價格昂貴的情况下,近年人們通過低壓的功率單元級聯的方式使這一問題得到很好的解决,因此級聯變頻器應用的領域和範圍也越來越廣泛,這使得高效、合理地利用能源(尤其是電能)成爲了可能。With the rapid development of modern power electronics and microelectronics technology, high-power inverters are constantly being matured, especially in the case where the reliability of medium and high-voltage device applications is not too high and expensive. In recent years, people have passed low voltage. The cascading of power units makes this problem well solved, so the field and scope of cascaded frequency converter applications is becoming more and more extensive, which makes it possible to use energy (especially electrical energy) efficiently and reasonably.
在級聯變頻器中,功率單元的數目根據變頻器電壓等級不同而不同。例如6kV變頻器,每相通常有5個或者6個功率單元串聯,每個功率單元提供相同的輸出電壓,共有15個或者18個功率單元,而10kV變頻器,功率單元的數目更是多達27個,如此多的功率單元,一旦某個功率單元發生故障,如果沒有合理的處理措施,則整個變頻器發生故障,無法繼續運行,就會造成一定的經濟損失或者將事故擴大化。變頻器的可靠性由於功率單元數目多而變低。In cascaded drives, the number of power units varies depending on the drive voltage level. For example, 6kV inverter, each phase usually has 5 or 6 power units connected in series, each power unit provides the same output voltage, a total of 15 or 18 power units, and 10kV inverter, the number of power units is up to 27, so many power units, once a power unit fails, if there is no reasonable treatment, the entire inverter will fail and cannot continue to operate, which will cause certain economic losses or enlarge the accident. The reliability of the frequency converter becomes lower due to the large number of power units.
功率單元旁路電路可以有效解决這個問題。由於功率單元在正常工作時是主電路導通,即主電路正常工作,則整個變頻器可正常工作,因此級聯型變頻器功率單元的旁路電路(BY PASS Circuit)是在一功率單元的主電路發生故障時,爲了不造成整個變頻器系統停機,將故障功率單元的主電路旁路(短路)的一種旁路裝置。現有技術中,在級聯型變頻器中,每個功率單元都有一個旁路電路,當某個功率單元的主電路發生故障而不能正常輸出電壓時,爲了不造成整個變頻器停機,需要利用故障單元的旁路電路將故障部分旁路(短路),即對應的旁路電路切上工作,這樣故障功率單元的主電路就會被旁路掉,就可以使整個變頻器繼續運行,保證不會由於變頻器停機造成經濟或者其他損失。The power unit bypass circuit can effectively solve this problem. Since the main circuit is turned on during the normal operation of the power unit, that is, the main circuit works normally, the entire inverter can work normally, so the BY PASS circuit of the power unit of the cascade type inverter is the main unit of a power unit. In the event of a circuit failure, a bypass device that bypasses (shorts) the main circuit of the faulty power unit in order not to cause the entire inverter system to shut down. In the prior art, in the cascade type inverter, each power unit has a bypass circuit. When the main circuit of a power unit fails and cannot output the voltage normally, in order not to cause the entire inverter to stop, it is necessary to utilize The bypass circuit of the faulty unit bypasses (short-circuits) the faulty part, that is, the corresponding bypass circuit is cut to work, so that the main circuit of the faulty power unit is bypassed, so that the entire frequency converter can continue to operate, ensuring no Economic or other losses due to inverter shutdown.
中國專利申請201010218945.2公開一種單元級聯高壓變頻器的單元旁路電路,該旁路電路功率單元出現故障時,需要手動閉合機械操作刀閘,更換出現故障的功率單元後再將該機械操作刀閘斷開,效率低下。Chinese Patent Application No. 201010218945.2 discloses a unit bypass circuit of a unit cascade high-voltage frequency converter. When the power unit of the bypass circuit fails, it is necessary to manually close the mechanical operation knife gate, replace the faulty power unit, and then operate the mechanical operation knife switch. Disconnected, inefficient.
現有技術還公開一種如圖1所示的采用接觸器的機械方式作爲旁路電路的技術方案,其由輔助開關KM控制其切合或者斷開,此旁路電路可靠性高,在小功率變頻器系統中很有優勢,但在大功率變頻器系統中,由於接觸器體積大且成本高,會使得系統設計更加複雜,成本較高。The prior art also discloses a technical solution using the mechanical mode of the contactor as the bypass circuit as shown in FIG. 1 , which is controlled by the auxiliary switch KM to be switched or disconnected. The bypass circuit has high reliability and is low in power inverter. There are advantages in the system, but in high-power inverter systems, due to the large size and high cost of the contactor, the system design is more complicated and the cost is higher.
綜上所述,現有技術的級聯型變頻器中的旁路電路具有成本高,體積大等缺點,需要進一步改進。In summary, the bypass circuit in the prior art cascaded frequency converter has the disadvantages of high cost, large volume, and the like, and needs further improvement.
本發明的目的在於提供一種級聯型變頻器、功率單元及其旁路模組,有效地解决了現有的旁路電路成本較高、體積大等問題,其電路結構簡單、導通損耗低、可靠性高。The object of the present invention is to provide a cascaded frequency converter, a power unit and a bypass module thereof, which effectively solve the problems of high cost and large volume of the existing bypass circuit, and the circuit structure is simple, the conduction loss is low, and the reliability is reliable. High sex.
爲實現本發明目的而提供的一種級聯型變頻器功率單元旁路模組,用於旁路該功率單元的主電路模組,該主電路模組包括熔斷器、整流器、母線電容、H逆變橋,從該H逆變橋上引出兩點作爲該主電路模組的一第一輸出端和一第二輸出端,包括旁路電路;該旁路電路包括一第一開關元件、一第二開關元件、一第一二極管和一第二二極管;該旁路電路包括一第一橋臂和一第二橋臂,該第一橋臂包括一開關元件,該第二橋臂包括一二極管;從該旁路電路的第一橋臂上引出一點作爲該旁路電路的第一輸入端,從該旁路電路的第二橋臂上引出一點作爲該旁路電路的第二輸入端,該第一輸入端和該主電路模組的第一輸出端電性連接,該第二輸入端和該主電路模組的第二輸出端電性連接;當該主電路模組發生故障且旁路電路切上工作時,該旁路電路的一開關元件和一二極管導通以旁路相應的功率單元的主電路模組。A cascaded inverter power unit bypass module for achieving the object of the present invention is used to bypass a main circuit module of the power unit, the main circuit module including a fuse, a rectifier, a bus capacitor, and an H inverse Transforming the bridge, two points are drawn from the H inverter bridge as a first output end and a second output end of the main circuit module, including a bypass circuit; the bypass circuit includes a first switching element, a second a switching element, a first diode and a second diode; the bypass circuit includes a first bridge arm and a second bridge arm, the first bridge arm includes a switching element, and the second bridge arm includes a diode; a point from the first leg of the bypass circuit as a first input of the bypass circuit, and a point from the second arm of the bypass circuit as a second input of the bypass circuit The first input end is electrically connected to the first output end of the main circuit module, and the second input end is electrically connected to the second output end of the main circuit module; when the main circuit module fails a switching element of the bypass circuit when the bypass circuit is cut A diode conduction to bypass the circuit module corresponding primary power unit.
其中,該第一開關元件爲第一絕緣栅雙極型晶體管,該第二開關元件爲第二絕緣栅雙極型晶體管。The first switching element is a first insulated gate bipolar transistor, and the second switching element is a second insulated gate bipolar transistor.
其中,該旁路電路包括該第一絕緣栅雙極型晶體管、該第二絕緣栅雙極型晶體管、該第一二極管和該第二二極管;該第一絕緣栅雙極型晶體管的發射極和該第二絕緣栅雙極型晶體管的集電極電性連接,該第一二極管的陽極和該第二二極管的陰極電性連接,該第一絕緣栅雙極型晶體管的集電極和該第一二極管的陰極電性連接,該第二絕緣栅雙極型晶體管的發射極和該第二二極管的陽極電性連接;在該第一絕緣栅雙極型晶體管和該第二絕緣栅雙極型晶體管之間的一點引出一導線作爲該旁路電路的第一輸入端;在該第一二極管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;該第一二極管和第一絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第二絕緣栅雙極型晶體管組成第二條支路;該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The bypass circuit includes the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode and the second diode; the first insulated gate bipolar transistor The emitter is electrically connected to the collector of the second insulated gate bipolar transistor, and the anode of the first diode and the cathode of the second diode are electrically connected, the first insulated gate bipolar transistor The collector is electrically connected to the cathode of the first diode, and the emitter of the second insulated gate bipolar transistor is electrically connected to the anode of the second diode; in the first insulated gate bipolar type a point between the transistor and the second insulated gate bipolar transistor leads a wire as a first input of the bypass circuit; a point between the first diode and the second diode leads a wire a second input terminal of the bypass circuit; the first diode and the first insulated gate bipolar transistor constitute a first branch, and the second diode and the second insulated gate bipolar transistor are formed a second branch; the first output end of the main circuit module is electrically connected to the side A second input of the first input of the circuit, a second output terminal of the main circuit module electrically connected to the bypass circuit.
其中,該旁路電路的第一輸入端接收的電流爲負,第二輸入端接收的電流爲正時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第一二極管和第一絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組,使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is negative, and the current received by the second input terminal is positive, the main circuit module of the power unit fails, and the bypass circuit is cut to work, then the bypass circuit The first diode and the first insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit, so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路的第一輸入端接收的電流爲正,第二輸入端接收的電流爲負時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第二二極管和第二絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組,使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is positive, and when the current received by the second input terminal is negative, the main circuit module of the power unit fails and the bypass circuit is cut to work, then the bypass circuit The second diode and the second insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit, so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路包括該第一絕緣栅雙極型晶體管、該第二絕緣栅雙極型晶體管、該第一二極管和該第二二極管;該第一絕緣栅雙極型晶體管的集電極和該第二絕緣栅雙極型晶體管的發射極電性連接,該第一二極管的陰極和該第二二極管的陽極電性連接,該第一絕緣栅雙極型晶體管的發射極和該第一二極管的陽極電性連接,該第二絕緣栅雙極型晶體管的集電極和該第二二極管的陰極電性連接;在該第一絕緣栅雙極型晶體管和該第二絕緣栅雙極型晶體管之間的一點引出一導線作爲該旁路電路的第一輸入端;在該第一二極管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;該第一二極管和第一絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第二絕緣栅雙極型晶體管組成第二條支路;該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The bypass circuit includes the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode and the second diode; the first insulated gate bipolar transistor The collector is electrically connected to the emitter of the second insulated gate bipolar transistor, and the cathode of the first diode is electrically connected to the anode of the second diode, the first insulated gate bipolar transistor The emitter is electrically connected to the anode of the first diode, the collector of the second insulated gate bipolar transistor is electrically connected to the cathode of the second diode; and the first insulated gate bipolar type a point between the transistor and the second insulated gate bipolar transistor leads a wire as a first input of the bypass circuit; a point between the first diode and the second diode leads a wire a second input terminal of the bypass circuit; the first diode and the first insulated gate bipolar transistor constitute a first branch, and the second diode and the second insulated gate bipolar transistor are formed a second branch; the first output end of the main circuit module is electrically connected to the side A second input of the first input of the circuit, a second output terminal of the main circuit module electrically connected to the bypass circuit.
其中,該旁路電路的第一輸入端接收的電流爲正,第二輸入端接收的電流爲負時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第一二極管和第一絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is positive, and when the current received by the second input terminal is negative, the main circuit module of the power unit fails and the bypass circuit is cut to work, then the bypass circuit The first diode and the first insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路的第一輸入端接收的電流爲負,第二輸入端接收的電流爲正時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第二二極管和第二絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is negative, and the current received by the second input terminal is positive, the main circuit module of the power unit fails, and the bypass circuit is cut to work, then the bypass circuit The second diode and the second insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路包括該第一絕緣栅雙極型晶體管、該第二絕緣栅雙極型晶體管、該第一二極管和該第二二極管;該第一絕緣栅雙極型晶體管的發射極和該第一二極管的陽極電性連接,該第二絕緣栅雙極型晶體管的發射極和該第二二極管的陽極電性連接,該第一絕緣栅雙極型晶體管的集電極和該第二二極管的陰極電性連接,該第二絕緣栅雙極型晶體管的集電極和該第一二極管的陰極電性連接;在該第一絕緣栅雙極型晶體管和該第一二極管之間的一點引出一導線作爲該旁路電路的第一輸入端;在該第二絕緣栅雙極型晶體管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;該第一二極管和第二絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第一絕緣栅雙極型晶體管組成第二條支路;該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The bypass circuit includes the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the first diode and the second diode; the first insulated gate bipolar transistor The emitter is electrically connected to the anode of the first diode, and the emitter of the second insulated gate bipolar transistor is electrically connected to the anode of the second diode, the first insulated gate bipolar transistor The collector is electrically connected to the cathode of the second diode, the collector of the second insulated gate bipolar transistor is electrically connected to the cathode of the first diode; and the first insulated gate bipolar type a point between the transistor and the first diode leads a wire as a first input of the bypass circuit; a point between the second insulated gate bipolar transistor and the second diode leads a wire a second input terminal of the bypass circuit; the first diode and the second insulated gate bipolar transistor form a first branch, and the second diode and the first insulated gate bipolar transistor are formed a second branch; the first output end of the main circuit module is electrically connected to the side A second input of the first input of the circuit, a second output terminal of the main circuit module electrically connected to the bypass circuit.
其中,該旁路電路的第一輸入端接收的電流爲正,第二輸入端接收的電流爲負時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第一二極管和第二絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is positive, and when the current received by the second input terminal is negative, the main circuit module of the power unit fails and the bypass circuit is cut to work, then the bypass circuit The first diode and the second insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路的第一輸入端接收的電流爲負,第二輸入端接收的電流爲正時,功率單元的主電路模組發生故障且旁路電路切上工作,則該旁路電路的第二二極管和第一絕緣栅雙極型晶體管導通以旁路相應的功率單元的主電路模組使整個級聯型變頻器仍能繼續工作。Wherein, the current received by the first input end of the bypass circuit is negative, and the current received by the second input terminal is positive, the main circuit module of the power unit fails, and the bypass circuit is cut to work, then the bypass circuit The second diode and the first insulated gate bipolar transistor are turned on to bypass the main circuit module of the corresponding power unit so that the entire cascaded frequency converter can continue to operate.
其中,該旁路電路還包括吸收電路,該吸收電路包括一吸收電容,該吸收電容並聯於該旁路電路的兩端。The bypass circuit further includes an absorbing circuit, and the absorbing circuit includes an absorbing capacitor connected in parallel to both ends of the bypass circuit.
其中,該吸收電路還包括第三保護電阻;該吸收電容和該第三保護電阻串聯連接後,並聯於該旁路電路的兩端。The absorbing circuit further includes a third protection resistor; the absorbing capacitor and the third protection resistor are connected in series and are connected in parallel to both ends of the bypass circuit.
其中,還包括第一保護電阻和第二保護電阻;該第一保護電阻的一端與該吸收電容的一端電性連接,該第一保護電阻的另一端與該母線電容一端電性連接;該第二保護電阻的一端與該吸收電容的另一端電性連接,該第二保護電阻的另一端與該母線電容的另一端電性連接。The first protection resistor and the second protection resistor are electrically connected to one end of the first protection resistor, and the other end of the first protection resistor is electrically connected to one end of the bus capacitor. One end of the second protection resistor is electrically connected to the other end of the absorption capacitor, and the other end of the second protection resistor is electrically connected to the other end of the bus capacitor.
其中,該旁路電路還包括RC支路和旁路電路狀態檢測單元;該RC支路包括第四電阻和儲能電容,該第四電阻和該儲能電容串聯連接後並聯在該旁路電路的兩端;該旁路電路狀態檢測單元與該RC支路並聯,用於檢測該旁路電路是否工作。The bypass circuit further includes an RC branch and a bypass circuit state detecting unit; the RC branch includes a fourth resistor and a storage capacitor, and the fourth resistor and the storage capacitor are connected in series and then connected in parallel to the bypass circuit The two ends of the bypass circuit state detecting unit are connected in parallel with the RC branch to detect whether the bypass circuit operates.
其中,還包括旁路控制電路,該旁路控制電路與該第一開關元件和該第二開關電性連接,用於控制該第一開關元件和該第二開關元件的導通或斷開。The bypass control circuit is further electrically connected to the first switching element and the second switch for controlling conduction or disconnection of the first switching element and the second switching element.
其中,該第一絕緣栅雙極型晶體管和第二絕緣栅雙極型晶體管的門極與該旁路控制電路連接。The gates of the first insulated gate bipolar transistor and the second insulated gate bipolar transistor are connected to the bypass control circuit.
本發明還公開一種級聯型變頻器功率單元,包括主電路模組、功率單元控制模組和旁路模組;該主電路模組包括熔斷器、整流器、母線電容、H逆變橋,從該H逆變橋上引出兩點作爲該主電路模組的兩個輸出端;該旁路模組爲如前所述的旁路模組;該旁路電路的兩個輸入端與該主電路模組的兩個輸出端對接;功率單元控制模組與該主電路模組和該旁路模組電性連接。The invention also discloses a cascading type inverter power unit, comprising a main circuit module, a power unit control module and a bypass module; the main circuit module comprises a fuse, a rectifier, a bus capacitor, and an H inverter bridge, The H inverter bridge leads two points as two output ends of the main circuit module; the bypass module is a bypass module as described above; two input ends of the bypass circuit and the main circuit mode The two output terminals of the group are docked; the power unit control module is electrically connected to the main circuit module and the bypass module.
其中,該功率單元控制模組包括控制電路和故障檢測單元;該故障檢測單元用於檢測該主電路模組是否故障;該控制電路用於在故障檢測單元檢測出故障時,發送故障檢測信號。The power unit control module includes a control circuit and a fault detecting unit. The fault detecting unit is configured to detect whether the main circuit module is faulty. The control circuit is configured to send a fault detection signal when the fault detecting unit detects a fault.
其中,該故障檢測單元包括缺相檢測電路和/或橋臂故障檢測電路;該缺相檢測電路與經過該熔斷器的交流電源的三相輸入電性連接,用於檢測該主電路模組在交流輸入端是否發生故障;該橋臂故障檢測電路與該H逆變橋電性連接,用於檢測該H逆變橋是否發生故障。The fault detecting unit includes a phase loss detecting circuit and/or a bridge arm fault detecting circuit; the phase loss detecting circuit is electrically connected to a three-phase input of an AC power source passing through the fuse, and is configured to detect that the main circuit module is in the Whether the AC input terminal is faulty; the bridge arm fault detection circuit is electrically connected to the H inverter bridge, and is used to detect whether the H inverter bridge is faulty.
本發明還公開一種級聯型變頻器,包括移相變壓器、功率單元和三相負載,該功率單元包括主電路模組、旁路模組和功率單元控制模組;該主電路模組包括熔斷器、整流器、母綫線電容、H逆變橋,從該H逆變橋上引出兩點作爲該主電路模組的兩個輸出端;該旁路模組爲如權利要求申請專利範圍第1項至第17項任一項所述的旁路模組;該旁路電路的兩個輸入端與該主電路模組的兩個輸出端對接;功率單元控制模組與該主電路模組和該旁路模組電性連接。The invention also discloses a cascade type frequency converter comprising a phase shifting transformer, a power unit and a three-phase load, the power unit comprising a main circuit module, a bypass module and a power unit control module; the main circuit module comprises a fuse , a rectifier, a busbar capacitor, an H-inverter bridge, two points are drawn from the H-inverter bridge as two output ends of the main circuit module; the bypass module is the first item of claim patent claim The bypass module of any one of the seventeenth; the two input ends of the bypass circuit are connected to the two output ends of the main circuit module; the power unit control module and the main circuit module and the The bypass module is electrically connected.
其中,該移相變壓器包括至少一副邊繞組。Wherein, the phase shifting transformer comprises at least one secondary winding.
其中,該移相變壓器的每一副邊繞組的三相輸出分別和該功率單元的三相輸入端連接。The three-phase output of each secondary winding of the phase shifting transformer is respectively connected to the three-phase input end of the power unit.
其中,該功率單元控制模組包括控制電路和故障檢測單元;該故障檢測單元用於檢測該主電路模組是否故障;該控制電路用於在故障檢測單元檢測出故障時,發送故障檢測信號。The power unit control module includes a control circuit and a fault detecting unit. The fault detecting unit is configured to detect whether the main circuit module is faulty. The control circuit is configured to send a fault detection signal when the fault detecting unit detects a fault.
其中,該故障檢測單元包括缺相檢測電路和/或橋臂故障檢測電路;該缺相檢測電路與經過該熔斷器的交流電源的三相輸入電性連接,用於檢測該主電路模組在交流輸入端是否發生故障;該橋臂故障檢測電路與該H逆變橋電性連接,用於檢測該H逆變橋是否發生故障。The fault detecting unit includes a phase loss detecting circuit and/or a bridge arm fault detecting circuit; the phase loss detecting circuit is electrically connected to a three-phase input of an AC power source passing through the fuse, and is configured to detect that the main circuit module is in the Whether the AC input terminal is faulty; the bridge arm fault detection circuit is electrically connected to the H inverter bridge, and is used to detect whether the H inverter bridge is faulty.
其中,該級聯型變頻器還包括一變頻器控制系統,當該故障檢測單元檢測到功率單元的主電路模組發生故障,該控制電路産生故障信號發送到該變頻器控制系統,該變頻器控制系統發送控制信號到該功率單元控制模組,觸發該旁路模組的該旁路控制電路,該旁路控制電路將該旁路電路切上工作以旁路故障的主電路模組。Wherein, the cascade type frequency converter further comprises a frequency converter control system, and when the fault detection unit detects that the main circuit module of the power unit is faulty, the control circuit generates a fault signal and sends the fault signal to the frequency converter control system, the frequency converter The control system sends a control signal to the power unit control module to trigger the bypass control circuit of the bypass module, and the bypass control circuit cuts the bypass circuit to bypass the faulty main circuit module.
其中,該級聯型變頻器還包括一變頻器控制系統,當該故障檢測單元檢測到功率單元的主電路模組發生故障,該控制電路産生故障信號發送到該變頻器控制系統,該變頻器控制系統發送控制信號觸發該旁路控制電路,該旁路控制電路將該旁路電路切上工作以旁路故障的主電路模組。Wherein, the cascade type frequency converter further comprises a frequency converter control system, and when the fault detection unit detects that the main circuit module of the power unit is faulty, the control circuit generates a fault signal and sends the fault signal to the frequency converter control system, the frequency converter The control system sends a control signal to trigger the bypass control circuit, and the bypass control circuit cuts the bypass circuit to bypass the faulty main circuit module.
本發明的有益效果是:本發明的級聯型變頻器、功率單元及其旁路模組,當該主電路模組發生故障且旁路電路切上工作時,該旁路電路的一開關元件和一二極管導通以旁路相應的功率單元的主電路模組,在保證變頻器正常運行的同時,損耗較小,電路結構簡單,在大功率變頻器系統中具有很好的成本優勢。The beneficial effects of the present invention are: a cascade type inverter, a power unit and a bypass module thereof according to the present invention, when the main circuit module fails and the bypass circuit is cut, a switching element of the bypass circuit And a diode is turned on to bypass the main circuit module of the corresponding power unit, while ensuring the normal operation of the frequency converter, the loss is small, the circuit structure is simple, and has a good cost advantage in the high-power inverter system.
爲了使本發明的目的、技術方案及優點更加清楚明白,以下結合附圖及實施例,對本發明的一種級聯型變頻器、功率單元及其旁路模組進行進一步詳細說明。應當理解,此處所描述的具體實施例僅僅用以解釋本發明,並不用於限定本發明。In order to make the objects, technical solutions and advantages of the present invention more clear, a cascading type inverter, a power unit and a bypass module thereof according to the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
在實施方式和申請專利範圍中,除非文中對於冠詞有特別限定,否則“一”與“該”可泛指單一個或複數個。In the scope of the embodiments and the claims, the terms "a" and "the" may mean a single or plural.
本文中所使用的“約”、“ 大約”或“大致”用以修飾任何可稍微變化的數量,但這種稍微變化並不會改變其本質。於實施方式中若無特別說明,以“約”、“ 大約”或“大致”所修飾的數值的誤差範圍一般是容許在百分之二十以內,較佳地是於百分之十以內,而更佳地是於百分五之以內。As used herein, "about", "about" or "substantially" is used to modify any quantity that may vary somewhat, but such slight variations do not alter the nature. In the embodiments, the numerical values modified by "about", "about" or "substantially" are generally allowed to be within 20%, preferably within 10%, unless otherwise stated. More preferably, it is within five percent.
實施例一Embodiment 1
如圖2所示,本發明實施例一提供了一種級聯型變頻器,包括移相變壓器T11和至少一個功率單元。As shown in FIG. 2, a first embodiment of the present invention provides a cascaded frequency converter including a phase shifting transformer T11 and at least one power unit.
如圖2所示,作爲一種示例方式,是一6kV的具有18個功率單元的級聯型變頻器系統示意圖,該級聯變頻器包括移相變壓器T11和三相級聯設置的18個功率單元(Power Cell),其中,每相由6個功率單元級聯輸出,該6個低壓的功率單元通過級聯的方式輸出高壓。As shown in FIG. 2, as an example, is a schematic diagram of a 6 kV cascaded frequency converter system with 18 power units, the cascaded frequency converter including a phase shifting transformer T11 and 18 power units arranged in a three-phase cascade. (Power Cell), wherein each phase is cascaded by 6 power units, and the 6 low voltage power units output high voltage by cascading.
圖3爲圖2中一個具有旁路模組2的功率單元的電路圖,該具有旁路模組2的功率單元包括主電路模組1、旁路模組2以及功率單元控制模組3。作爲一種可實施方式,該主電路模組1包括熔斷器11、整流器12、母線電容13、H逆變橋(逆變橋臂)14。3 is a circuit diagram of a power unit having a bypass module 2 of FIG. 2, the power unit having the bypass module 2 including a main circuit module 1, a bypass module 2, and a power unit control module 3. As an implementation manner, the main circuit module 1 includes a fuse 11, a rectifier 12, a bus capacitor 13, and an H inverter bridge (inverter bridge arm) 14.
作爲一種可實施方式,移相變壓器的一個副邊繞組的三相(U、V、W)輸出分別連接一個功率單元的三相輸入端,且此三相交流電經整流器12整流爲直流電,於本實施例中,該整流器12爲二極管整流,於其它實施例中,可爲其它形式的整流器。整流器12輸出的直流電壓連接到母線電容13上,然後,H逆變橋14將該直流電壓逆變爲交流電壓,每一H逆變橋14包括一第一輸出端A和一第二輸出端B,即每一個功率單元的主電路模組1都具有一第一輸出端A和一第二輸出端B。As an implementation manner, three-phase (U, V, W) outputs of one secondary winding of the phase shifting transformer are respectively connected to three-phase input terminals of one power unit, and the three-phase alternating current is rectified into direct current by the rectifier 12, In an embodiment, the rectifier 12 is diode rectified, and in other embodiments, may be other forms of rectifier. The DC voltage outputted by the rectifier 12 is connected to the bus capacitor 13, and then the H inverter bridge 14 inverts the DC voltage into an AC voltage. Each H inverter bridge 14 includes a first output terminal A and a second output terminal. B, that is, the main circuit module 1 of each power unit has a first output terminal A and a second output terminal B.
如圖2所示,在級聯變頻器中,功率單元A1、A2、A3、A4、A5、A6級聯輸出變頻器的第一相電壓,即,功率單元A1的第二輸出端B連接功率單元A2的第一輸出端A,功率單元A2的第二輸出端B連接功率單元A3的第一輸出端A,功率單元A3的第二輸出端B連接功率單元A4的一輸出端A,功率單元A4的第二輸出端B連接功率單元A5的第一輸出端A,功率單元A5的第第二輸出端B連接功率單元A6的第一輸出端A以得到該變頻器的第一相輸出。同樣地,功率單元B1、B2、B3、B4、B5、B6級聯設置以得到該變頻器的第二相輸出,功率單元C1、C2、C3、C4、C5、C6級聯設置以得到該變頻器的第三相輸出,所輸出的三相電壓爲電機等三相負載供電。As shown in FIG. 2, in the cascaded frequency converter, the power unit A1, A2, A3, A4, A5, A6 cascades the first phase voltage of the output inverter, that is, the second output terminal B of the power unit A1 is connected to the power. The first output A of the unit A2, the second output B of the power unit A2 is connected to the first output A of the power unit A3, and the second output B of the power unit A3 is connected to an output A of the power unit A4, the power unit The second output terminal B of A4 is connected to the first output terminal A of the power unit A5, and the second output terminal B of the power unit A5 is connected to the first output terminal A of the power unit A6 to obtain the first phase output of the frequency converter. Similarly, the power units B1, B2, B3, B4, B5, B6 are cascaded to obtain the second phase output of the frequency converter, and the power units C1, C2, C3, C4, C5, C6 are cascaded to obtain the frequency conversion. The third phase output of the device, the output three-phase voltage is supplied to a three-phase load such as a motor.
本發明實施例一中的移相變壓器T11是一種現有技術,本領域技術人員根據本發明實施例一公開的技術方案內容能够實現該移相變壓器T11,因此,在本發明實施例一中,不再一一詳細描述。The phase shifting transformer T11 in the first embodiment of the present invention is a prior art, and the phase shifting transformer T11 can be realized by those skilled in the art according to the technical solution disclosed in the first embodiment of the present invention. Therefore, in the first embodiment of the present invention, A detailed description will be given one by one.
作爲一種可實施方式,本發明實施例一的旁路模組2包括旁路電路21和旁路控制電路22。As an implementation manner, the bypass module 2 of the first embodiment of the present invention includes a bypass circuit 21 and a bypass control circuit 22.
作爲一種可實施方式,功率單元的H逆變橋14可以由任何其開關狀態受其控制端控制的開關元件構成。作爲本可實施方式,功率單元的H逆變橋14的開關元件爲絕緣栅雙極型晶體管(IGBT,Insulated Gate Bipolar Transistor),其包括第三絕緣栅雙極型晶體管Q3、第四絕緣栅雙極型晶體管Q4,第五絕緣栅雙極型晶體管Q5和第六絕緣栅雙極型晶體管Q6;第三絕緣栅雙極型晶體管Q3和第四絕緣栅雙極型晶體管Q4串聯組成該H逆變橋14的一橋臂,第五絕緣栅雙極型晶體管Q5和第六絕緣栅雙極型晶體管Q6串聯組成該H逆變橋14的另一橋臂。兩橋臂的兩端電性連接組成功率單元的H逆變橋14。該H逆變橋14的一橋臂的中點爲H逆變橋14(也即主電路模組1)的第一輸出端,即輸出端A;該H逆變橋14的另一橋臂的中點爲H逆變橋14(也即主電路模組1)的第二輸出端,即輸出端B。且主電路模組1的兩輸出端連接到旁路電路21的兩輸入端。As an implementation, the H-inverter bridge 14 of the power unit can be constructed of any switching element whose switching state is controlled by its control terminal. As a possible implementation, the switching element of the H inverter bridge 14 of the power unit is an insulated gate bipolar transistor (IGBT), which includes a third insulated gate bipolar transistor Q3 and a fourth insulated gate double a pole transistor Q4, a fifth insulated gate bipolar transistor Q5 and a sixth insulated gate bipolar transistor Q6; a third insulated gate bipolar transistor Q3 and a fourth insulated gate bipolar transistor Q4 are connected in series to form the H inverter A bridge arm of the bridge 14, a fifth insulated gate bipolar transistor Q5 and a sixth insulated gate bipolar transistor Q6 are connected in series to form the other bridge arm of the H inverter bridge 14. Both ends of the two bridge arms are electrically connected to the H inverter bridge 14 constituting the power unit. The midpoint of one of the bridge arms of the H inverter bridge 14 is the first output end of the H inverter bridge 14 (ie, the main circuit module 1), that is, the output end A; the middle of the other bridge arm of the H inverter bridge 14 The point is the second output of the H inverter bridge 14 (ie, the main circuit module 1), that is, the output terminal B. And the two output ends of the main circuit module 1 are connected to the two input ends of the bypass circuit 21.
如圖4所示,作爲一種實施例方式,該功率單元控制模組3包括控制電路31和故障檢測單元32。故障檢測單元32包括缺相檢測電路321和/或橋臂故障檢測電路322,於其它實施例中,功率單元亦可包括其它形式的故障檢測電路。As shown in FIG. 4, as an embodiment, the power unit control module 3 includes a control circuit 31 and a fault detecting unit 32. The fault detection unit 32 includes a phase loss detection circuit 321 and/or a bridge arm fault detection circuit 322. In other embodiments, the power unit may also include other forms of fault detection circuitry.
在級聯型變頻器的功率單元正常工作時,本發明的旁路模組2不工作,變頻器各相的功率單元中的逆變橋臂的輸出端串聯以得到變頻器的各相輸出。一旦級聯型變頻器中的一個或多個功率單元發生故障,如缺相檢測電路321檢測到功率單元的輸入端有缺相和/或橋臂故障檢測電路322檢測到主電路模組1的逆變橋臂發生故障,則控制電路31産生故障信號發送到變頻器控制系統(未顯示);再由變頻器控制系統發送控制信號到功率單元控制模組3,觸發該旁路模組2的旁路控制電路22,旁路控制電路22將該旁路電路21切上工作以旁路相應功率單元的主電路模組;或者,由變頻器控制系統(未顯示)直接發送控制信號到旁路控制電路22,其後旁路控制電路22將旁路電路21切上工作以旁路相應故障的功率單元的主電路模組1。如此以來,即使其中一個或多個功率單元發生故障整個級聯型變頻器仍能繼續工作,大大提高了變頻器系統運行的可靠性。When the power unit of the cascade type inverter is working normally, the bypass module 2 of the present invention does not work, and the output ends of the inverter bridge arms in the power units of the inverter phases are connected in series to obtain the output of each phase of the inverter. Once one or more of the power units in the cascaded frequency converter fails, the phase loss detection circuit 321 detects that there is a phase loss at the input of the power unit and/or the bridge arm fault detection circuit 322 detects the main circuit module 1 When the inverter bridge arm fails, the control circuit 31 generates a fault signal and sends it to the inverter control system (not shown); then the inverter control system sends a control signal to the power unit control module 3 to trigger the bypass module 2 Bypass control circuit 22, bypass control circuit 22 cuts the bypass circuit 21 to bypass the main circuit module of the corresponding power unit; or, the inverter control system (not shown) directly transmits the control signal to the bypass The control circuit 22, after which the bypass control circuit 22 cuts the bypass circuit 21 to bypass the main circuit module 1 of the corresponding failed power unit. In this way, even if one or more of the power units fail, the entire cascaded inverter can continue to work, greatly improving the reliability of the operation of the inverter system.
實施例二Embodiment 2
作爲一種可實施方式,本發明實施例一的級聯型變頻器的功率單元旁路模組,包括旁路電路21和旁路控制電路22。As a possible implementation, the power unit bypass module of the cascade type inverter of the first embodiment of the present invention includes a bypass circuit 21 and a bypass control circuit 22.
該旁路電路21包括一第一開關元件、一第二開關元件、一第一二極管和一第二二極管;The bypass circuit 21 includes a first switching element, a second switching element, a first diode and a second diode;
該旁路電路21包括一第一輸入端和一第二輸入端,該第一輸入端和該主電路模組1的第一輸出端電性連接,該第二輸入端和該主電路模組1的第二輸出端電性連接。當該主電路模組1發生故障且旁路電路21切上工作時,該旁路電路21的一開關元件和一二極管導通以旁路相應的功率單元的主電路模組1。The bypass circuit 21 includes a first input end and a second input end. The first input end is electrically connected to the first output end of the main circuit module 1 , the second input end and the main circuit module The second output of 1 is electrically connected. When the main circuit module 1 fails and the bypass circuit 21 is switched to work, a switching element of the bypass circuit 21 and a diode are turned on to bypass the main circuit module 1 of the corresponding power unit.
該第一開關元件和該第二開關元件爲任何其開關狀態受其控制端控制的開關元件。The first switching element and the second switching element are any switching elements whose switching states are controlled by their control terminals.
如圖5所示,作爲一種可實施方式,旁路電路21的開關元件爲絕緣栅雙極型晶體管,旁路電路21包括第一絕緣栅雙極型晶體管Q1、第二絕緣栅雙極型晶體管Q2、第一二極管D1和第二二極管D2。As shown in FIG. 5, as an implementation manner, the switching element of the bypass circuit 21 is an insulated gate bipolar transistor, and the bypass circuit 21 includes a first insulated gate bipolar transistor Q1 and a second insulated gate bipolar transistor. Q2, a first diode D1 and a second diode D2.
該第一絕緣栅雙極型晶體管Q1和該第二絕緣栅雙極型晶體管Q2串接組成第一橋臂,第一絕緣栅雙極型晶體管Q1的發射極和第二絕緣栅雙極型晶體管Q2的集電極電性連接。該第一二極管D1和該第二二極管D2串接組成第二橋臂,第一二極管D1的陽極和該第二二極管D2的陰極電性連接。第一橋臂和第二橋臂的兩端對接,即第一絕緣栅雙極型晶體管Q1的集電極和第一二極管D1的陰極電性連接,第二絕緣栅雙極型晶體管Q2的發射極和第二二極管D2的陽極電性連接。The first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 are connected in series to form a first bridge arm, an emitter of the first insulated gate bipolar transistor Q1 and a second insulated gate bipolar transistor The collector of Q2 is electrically connected. The first diode D1 and the second diode D2 are connected in series to form a second bridge arm, and an anode of the first diode D1 and a cathode of the second diode D2 are electrically connected. The two ends of the first bridge arm and the second bridge are butted, that is, the collector of the first insulated gate bipolar transistor Q1 is electrically connected to the cathode of the first diode D1, and the second insulated gate bipolar transistor Q2 is The emitter is electrically connected to the anode of the second diode D2.
第一絕緣栅雙極型晶體管Q1和第二絕緣栅雙極型晶體管Q2同向串接,第一二極管D1和第二二極管D2也同向串接。The first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 are connected in series in the same direction, and the first diode D1 and the second diode D2 are also connected in series in the same direction.
在第一絕緣栅雙極型晶體管Q1和第二絕緣栅雙極型晶體管Q2之間的一點引出一導線作爲該旁路電路21的第一輸入端;在第一二極管D1和第二二極管D2之間的一點引出一導線作爲該旁路電路21的第二輸入端。A wire is drawn at a point between the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 as a first input terminal of the bypass circuit 21; at the first diode D1 and the second diode A point between the pole tubes D2 leads a wire as the second input of the bypass circuit 21.
作爲一種可實施方式,如圖6所示,爲主電路模組1與旁路電路21連接的示意圖。功率單元的主電路模組1的第一輸出端A電性連接到旁路電路21的第一輸入端;功率單元的主電路模組1的第二輸出端B電性連接到旁路電路21的第二輸入端,即圖3中所示點A也爲該旁路電路21的第一輸入端,點B也爲該旁路電路21的第二輸入端。As an implementation manner, as shown in FIG. 6, a schematic diagram of the main circuit module 1 and the bypass circuit 21 is connected. The first output terminal A of the main circuit module 1 of the power unit is electrically connected to the first input end of the bypass circuit 21; the second output terminal B of the main circuit module 1 of the power unit is electrically connected to the bypass circuit 21 The second input, that is, the point A shown in FIG. 3 is also the first input of the bypass circuit 21, and the point B is also the second input of the bypass circuit 21.
該旁路電路21的第一二極管D1和第一絕緣栅雙極型晶體管Q1組成一條支路;而第二二極管D2和第二絕緣栅雙極型晶體管Q2組成另一條支路,在交流輸出的的負半周期或正半周期內,兩條支路中的一條支路導通。The first diode D1 of the bypass circuit 21 and the first insulated gate bipolar transistor Q1 form a branch; and the second diode D2 and the second insulated gate bipolar transistor Q2 form another branch. One of the two branches is turned on during the negative half cycle or the positive half cycle of the AC output.
如圖7所示,如在旁路電路21的第一輸入端(A)接收的電流爲負,第二輸入端(B)接收的電流爲正,也即功率單元的逆變橋臂的第一輸出端A流出電流,功率單元的逆變橋臂的第二輸出端B流入電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第一二極管D1和第一絕緣栅雙極型晶體管Q1導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作,電流方向如圖7中箭頭所示。As shown in FIG. 7, as the current received at the first input terminal (A) of the bypass circuit 21 is negative, the current received at the second input terminal (B) is positive, that is, the inverter arm of the power unit. When an output terminal A flows current and the second output terminal B of the inverter bridge arm of the power unit flows current, the main circuit module 1 fails and the bypass circuit 21 is cut, the first two poles of the bypass circuit 21 The tube D1 and the first insulated gate bipolar transistor Q1 are turned on to bypass the corresponding main circuit module 1, so that the entire cascade type inverter can continue to operate, and the current direction is as indicated by an arrow in FIG.
如圖8所示,如在旁路電路21的第一輸入端(A)接收的電流爲正,第二輸入端(B)接收的電流爲負也即功率單元的逆變橋臂的第一輸出端A流入電流,功率單元的逆變橋臂的第二輸出端B流出電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第二二極管D2和第二絕緣栅雙極型晶體管Q2導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作,電流方向如圖8中箭頭所示。As shown in FIG. 8, as the current received at the first input (A) of the bypass circuit 21 is positive, the current received at the second input (B) is negative, that is, the first of the inverter arms of the power unit. When the output terminal A flows current and the second output terminal B of the inverter bridge arm of the power unit flows out of the current, the main circuit module 1 fails and the bypass circuit 21 cuts off, the second diode of the bypass circuit 21 D2 and the second insulated gate bipolar transistor Q2 are turned on to bypass the corresponding main circuit module 1, so that the entire cascade type inverter can continue to operate, and the current direction is as shown by the arrow in FIG.
如圖9所示,作爲旁路電路21的另一種可實施方式,該第一絕緣栅雙極型晶體管Q1的集電極和該第二絕緣栅雙極型晶體管Q2的發射極電性連接構成旁路電路21的第一橋臂;該第一二極管D1的陰極和該第二二極管D2的陽極電性連接構成旁路電路21的第二橋臂,第一橋臂和第二橋臂的兩端電性連接。其中第一橋臂的中點作爲旁路電路21的第一輸入端A;第二橋臂的中點作爲旁路電路21的第二輸入端B。As shown in FIG. 9, as another implementation manner of the bypass circuit 21, the collector of the first insulated gate bipolar transistor Q1 and the emitter of the second insulated gate bipolar transistor Q2 are electrically connected to each other. The first bridge arm of the circuit 21; the cathode of the first diode D1 and the anode of the second diode D2 are electrically connected to form a second bridge arm of the bypass circuit 21, the first bridge arm and the second bridge Both ends of the arm are electrically connected. The midpoint of the first bridge arm serves as the first input A of the bypass circuit 21; the midpoint of the second bridge serves as the second input B of the bypass circuit 21.
如在旁路電路21的第一輸入端(A)接收的電流爲正,第二輸入端(B)接收的電流爲負也即功率單元的逆變橋臂的第一輸出端A流入電流,功率單元的逆變橋臂的第二輸出端B流出電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第一二極管D1和第一絕緣栅雙極型晶體管Q1導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作。If the current received at the first input terminal (A) of the bypass circuit 21 is positive, and the current received at the second input terminal (B) is negative, that is, the first output terminal A of the inverter bridge arm of the power unit flows current, When the second output terminal B of the inverter bridge arm of the power unit is out of current, the main circuit module 1 fails and the bypass circuit 21 is cut, the first diode D1 of the bypass circuit 21 and the first insulated gate The bipolar transistor Q1 is turned on to bypass the corresponding main circuit module 1, so that the entire cascaded inverter can continue to operate.
如在旁路電路21的第一輸入端(A)接收的電流爲負,第二輸入端(B)接收的電流爲正也即功率單元的逆變橋臂的第一輸出端A流出電流,功率單元的逆變橋臂的第二輸出端B流入電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第二二極管D2和第二絕緣栅雙極型晶體管Q2導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作。If the current received at the first input terminal (A) of the bypass circuit 21 is negative, the current received by the second input terminal (B) is positive, that is, the first output terminal A of the inverter bridge arm of the power unit flows current, When the second output terminal B of the inverter arm of the power unit flows current, the main circuit module 1 fails and the bypass circuit 21 is cut, the second diode D2 and the second insulated gate of the bypass circuit 21 The bipolar transistor Q2 is turned on to bypass the corresponding main circuit module 1, so that the entire cascaded inverter can continue to operate.
如圖10所示,作爲旁路電路21的再一種可實施方式,該第一絕緣栅雙極型晶體管Q1管的發射極和該第一二極管D1的陽極電性連接構成旁路電路21的第一橋臂,第二絕緣栅雙極型晶體管Q2管的發射極和第二二極管D2的陽極電性連接構成旁路電路21的第二橋臂,第一橋臂和第二橋臂的兩端電性連接。其中第一橋臂的中點作爲旁路電路21的第一輸入端A;第二橋臂的中點作爲旁路電路21的第二輸入端B。As shown in FIG. 10, as another implementation manner of the bypass circuit 21, the emitter of the first insulated gate bipolar transistor Q1 and the anode of the first diode D1 are electrically connected to form a bypass circuit 21. The first bridge arm, the emitter of the second insulated gate bipolar transistor Q2 and the anode of the second diode D2 are electrically connected to form the second bridge arm of the bypass circuit 21, the first bridge arm and the second bridge Both ends of the arm are electrically connected. The midpoint of the first bridge arm serves as the first input A of the bypass circuit 21; the midpoint of the second bridge serves as the second input B of the bypass circuit 21.
如在旁路電路21的第一輸入端(A)接收的電流爲正,第二輸入端(B)接收的電流爲負也即功率單元的逆變橋臂的第一輸出端A流入電流,功率單元的逆變橋臂的第二輸出端B流出電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第一二極管D1和第二絕緣栅雙極型晶體管Q2導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作。If the current received at the first input terminal (A) of the bypass circuit 21 is positive, and the current received at the second input terminal (B) is negative, that is, the first output terminal A of the inverter bridge arm of the power unit flows current, When the second output terminal B of the inverter arm of the power unit flows out of current, the main circuit module 1 fails and the bypass circuit 21 is cut, the first diode D1 and the second insulated gate of the bypass circuit 21 The bipolar transistor Q2 is turned on to bypass the corresponding main circuit module 1, so that the entire cascaded inverter can continue to operate.
如在旁路電路21的第一輸入端(A)接收的電流爲負,第二輸入端(B)接收的電流爲正也即功率單元的逆變橋臂的第一輸出端A流出電流,功率單元的逆變橋臂的第二輸出端B流入電流時,主電路模組1發生故障且旁路電路21切上工作,則旁路電路21的第二二極管D2和第一絕緣栅雙極型晶體管Q1導通以旁路相應的主電路模組1,使整個級聯型變頻器仍能繼續工作。If the current received at the first input terminal (A) of the bypass circuit 21 is negative, the current received by the second input terminal (B) is positive, that is, the first output terminal A of the inverter bridge arm of the power unit flows current, When the second output terminal B of the inverter arm of the power unit flows current, the main circuit module 1 fails and the bypass circuit 21 is cut, the second diode D2 of the bypass circuit 21 and the first insulated gate The bipolar transistor Q1 is turned on to bypass the corresponding main circuit module 1, so that the entire cascaded inverter can continue to operate.
如圖11所示,該級聯型變頻器的功率單元旁路模組還設置有旁路控制電路22,該旁路控制電路22電性連接至旁路電路21的該開關元件,用以控制該開關元件的斷開或導通。As shown in FIG. 11, the power unit bypass module of the cascade type inverter is further provided with a bypass control circuit 22, and the bypass control circuit 22 is electrically connected to the switching element of the bypass circuit 21 for controlling The switching element is turned off or on.
以圖5所示的旁路電路21爲例來說明該旁路控制電路22與該旁路電路21的連接關係。該第一絕緣栅雙極型晶體管Q1和第二絕緣栅雙極型晶體管Q2的門極與該旁路控制電路22連接,該旁路控制電路22用於控制該兩個絕緣栅雙極型晶體管的導通或斷開,該旁路控制電路22還與該功率單元控制模組連接。The connection relationship between the bypass control circuit 22 and the bypass circuit 21 will be described by taking the bypass circuit 21 shown in FIG. 5 as an example. The gates of the first insulated gate bipolar transistor Q1 and the second insulated gate bipolar transistor Q2 are connected to the bypass control circuit 22, and the bypass control circuit 22 is configured to control the two insulated gate bipolar transistors The bypass control circuit 22 is also connected to the power unit control module.
在級聯型變頻器的功率單元正常工作時,本發明的旁路模組2不工作,變頻器各相的功率單元中的逆變橋臂的輸出端串聯以得到逆變橋臂的各相輸出。一旦級聯型變頻器中的其中一個或多個功率單元發生故障,則控制電路將故障檢測電路檢測到的故障信號發送到變頻器控制系統(未顯示);再由變頻器控制系統發送控制信號到功率單元控制模組3,觸發該功率單元的旁路控制電路22,旁路控制電路22將該旁路電路21切上工作,將該發生故障的功率單元的主電路模組1短路,從而保證在某一功率單元的主電路模組1發生故障時,切換到功率單元的旁路上進行工作,進而不影響整個級聯型變頻器的其他功率單元的正常工作,大大提高了變頻器系統運行的可靠性。When the power unit of the cascade type inverter works normally, the bypass module 2 of the present invention does not work, and the output ends of the inverter bridge arms in the power units of the inverter phases are connected in series to obtain the phases of the inverter bridge arm. Output. Once one or more power units in the cascaded frequency converter fail, the control circuit sends a fault signal detected by the fault detection circuit to the frequency converter control system (not shown); and then the control signal is sent by the frequency converter control system. Go to the power unit control module 3, trigger the bypass control circuit 22 of the power unit, and the bypass control circuit 22 cuts the bypass circuit 21 to short-circuit the main circuit module 1 of the failed power unit, thereby Ensure that when the main circuit module 1 of a power unit fails, switch to the bypass of the power unit to work, and thus does not affect the normal operation of the other power units of the entire cascade inverter, greatly improving the operation of the inverter system. Reliability.
實施例三Embodiment 3
作爲一種可實施方式,本發明所提供的旁路模組2包括旁路電路21和旁路控制電路22,該旁路電路21包括第一絕緣栅雙極型晶體管Q1、第二絕緣栅雙極型晶體管Q2、第一二極管D1、第二二極管D2和一吸收電路211。As an implementation manner, the bypass module 2 provided by the present invention includes a bypass circuit 21 and a bypass control circuit 22, and the bypass circuit 21 includes a first insulated gate bipolar transistor Q1 and a second insulated gate bipolar. The transistor Q2, the first diode D1, the second diode D2, and an absorption circuit 211.
作爲一種可實施方式,該吸收電路211爲一吸收電容C1。如圖12所示,以圖5所示的旁路電路21爲例,該吸收電容C1並聯於該旁路電路21也即該第一二極管D1和該第二二極管D2串接的橋臂的兩端。As an implementation manner, the absorbing circuit 211 is a snubber capacitor C1. As shown in FIG. 12, taking the bypass circuit 21 shown in FIG. 5 as an example, the snubber capacitor C1 is connected in parallel to the bypass circuit 21, that is, the first diode D1 and the second diode D2 are connected in series. Both ends of the bridge arm.
參見圖13,圖13所示爲如圖12所示的旁路電路21連接到主電路模組1上的一種實施方式,該主電路模組1的兩個輸出端分別和旁路電路21的兩個輸入端電性連接。Referring to FIG. 13, FIG. 13 shows an embodiment in which the bypass circuit 21 shown in FIG. 12 is connected to the main circuit module 1. The two output ends of the main circuit module 1 and the bypass circuit 21 are respectively The two inputs are electrically connected.
作爲一種可實施方式,該功率單元還包括第一保護電阻R1和第二保護電阻R2,該第一保護電阻R1的一端與該吸收電容C1的一端連接,該第一保護電阻R1的另一端與該主電路模組1的母線電容13的一端連接;該第二保護電阻R2的一端與該吸收電容C1的另一端連接,該第二保護電阻R2的另一端與該主電路模組1的母線電容13的另一端連接。As an implementation manner, the power unit further includes a first protection resistor R1 and a second protection resistor R2. One end of the first protection resistor R1 is connected to one end of the absorption capacitor C1, and the other end of the first protection resistor R1 is One end of the bus capacitor 13 of the main circuit module 1 is connected; one end of the second protection resistor R2 is connected to the other end of the absorption capacitor C1, and the other end of the second protection resistor R2 is connected to the bus of the main circuit module 1 The other end of the capacitor 13 is connected.
主電路模組1的母線電容13的漏感比較大和/或在主電路模組1發生故障導致主電路模組1的H逆變橋14的絕緣栅雙極型晶體管關斷很快時,如果主電路模組1的輸出被短路,則可能在主電路模組1的H逆變橋14保護關斷時,在主電路模組1的輸出端A和B之間産生很高的電壓尖峰和/或伴隨高頻電壓振蕩,且振蕩峰值很大。此電壓尖峰可能接近或超過旁路電路21的絕緣栅雙極型晶體管等器件的電壓安全工作區。The leakage inductance of the bus capacitor 13 of the main circuit module 1 is relatively large and/or when the main circuit module 1 fails, causing the insulated gate bipolar transistor of the H inverter bridge 14 of the main circuit module 1 to be turned off quickly, if When the output of the main circuit module 1 is short-circuited, it is possible to generate a high voltage spike between the output terminals A and B of the main circuit module 1 when the H-inverter bridge 14 of the main circuit module 1 is protected from being turned off. / or with high-frequency voltage oscillation, and the oscillation peak is large. This voltage spike may approach or exceed the voltage safe operating region of a device such as an insulated gate bipolar transistor of the bypass circuit 21.
因此,爲了防止絕緣栅雙極型晶體管等器件被損壞,作爲一種可實施方式,旁路電路21設置了該吸收電容C1,且設置了該第一保護電阻R1和該第二保護電阻R2,在功率單元正常工作時該主電路模組1通過該第一保護電阻R1和該第二保護電阻R2給吸收電容C1充電以防止在功率單元正常工作時,旁路電路21形成全橋整流結構對吸收電容C1進行充電而導致功率單元的不正常工作,提高了系統運行的可靠性。由於絕緣栅雙極型晶體管Q1和Q2以及二極管D1和D2的漏電流較小,該第一保護電阻R1和該第二保護電阻R2的損耗也比較小。Therefore, in order to prevent the device such as the insulated gate bipolar transistor from being damaged, as an implementation manner, the bypass circuit 21 is provided with the absorption capacitor C1, and the first protection resistor R1 and the second protection resistor R2 are disposed. When the power unit is working normally, the main circuit module 1 charges the absorption capacitor C1 through the first protection resistor R1 and the second protection resistor R2 to prevent the bypass circuit 21 from forming a full bridge rectification structure when the power unit is working normally. Capacitor C1 is charged to cause abnormal operation of the power unit, which improves the reliability of the system operation. Since the leakage currents of the insulated gate bipolar transistors Q1 and Q2 and the diodes D1 and D2 are small, the losses of the first protection resistor R1 and the second protection resistor R2 are also relatively small.
如圖14所示,作爲一種可實施方式,該吸收電路211還包括第三電阻R3。該吸收電容 C1和該第三電阻R3串接後並聯於該旁路電路21也即由該第一二極管D1和該第二二極管D2串聯連接組成的橋臂的兩端。As shown in FIG. 14, as an embodiment, the absorbing circuit 211 further includes a third resistor R3. The snubber capacitor C1 and the third resistor R3 are connected in series and then connected in parallel to the bypass circuit 21, that is, both ends of the bridge arm composed of the first diode D1 and the second diode D2 connected in series.
如圖15所示,作爲一種可實施方式,該旁路電路21還包括一串聯的RC支路以及一旁路電路狀態檢測單元212,其中該RC支路由第四電阻R4和儲能電容C2串聯連接構成,並聯在旁路電路21橋臂的兩端,該旁路電路狀態檢測單元212用於檢測旁路電路21是否切上工作。As shown in FIG. 15, the bypass circuit 21 further includes a series RC branch and a bypass circuit state detecting unit 212, wherein the RC branch routes the fourth resistor R4 and the storage capacitor C2 are connected in series. The configuration is paralleled at both ends of the bridge arm of the bypass circuit 21, and the bypass circuit state detecting unit 212 is configured to detect whether the bypass circuit 21 is cut or not.
當功率單元正常工作時,輸出端(A、B)輸出脉衝電壓,通過旁路電路21的第一絕緣栅雙極型晶體管Q1或第二絕緣栅雙極型晶體管Q2上固有的反並聯二極管,以及旁路電路21的第二二極管D2或第一二極管D1形成整流電路,給並聯的RC支路的儲能電容C2充電,此時第四電阻R4的阻值可選擇很大,例如爲幾十千歐,儲能電容C2的電壓一直保持高電壓。When the power unit is working normally, the output terminal (A, B) outputs a pulse voltage, and the anti-parallel diode inherent in the first insulated gate bipolar transistor Q1 or the second insulated gate bipolar transistor Q2 of the bypass circuit 21 is passed. And the second diode D2 or the first diode D1 of the bypass circuit 21 forms a rectifying circuit for charging the storage capacitor C2 of the parallel RC branch, and the resistance of the fourth resistor R4 can be selected greatly. For example, for several tens of kiloohms, the voltage of the storage capacitor C2 is always kept at a high voltage.
當功率單元的主電路模組1發生故障時,旁路電路21切上工作,即同時導通絕緣栅雙極型晶體管Q1和Q2,這樣RC支路的電容C2上的電壓會迅速的放到零。因此可以通過檢測RC支路的電容C2上的電壓來確定旁路電路21的工作狀態,當電容C2上的電壓爲高電位時認爲功率單元正常工作,也即旁路電路21沒有切上工作;當電容C2上的電壓爲低電位時認爲功率單元的主電路模組1發生故障,也即旁路電路21切上工作。When the main circuit module 1 of the power unit fails, the bypass circuit 21 is switched to work, that is, the insulated gate bipolar transistors Q1 and Q2 are turned on at the same time, so that the voltage on the capacitor C2 of the RC branch is quickly placed to zero. . Therefore, the operating state of the bypass circuit 21 can be determined by detecting the voltage on the capacitor C2 of the RC branch. When the voltage on the capacitor C2 is high, the power unit is considered to be working normally, that is, the bypass circuit 21 is not cut. When the voltage on the capacitor C2 is low, it is considered that the main circuit module 1 of the power unit is malfunctioning, that is, the bypass circuit 21 is cut to work.
作爲一種可實施方式,在變頻器功率等級比較大時,本發明實施例二和實施例三中的旁路電路21的該第一開關元件和該第二開關元件可設置由多個開關元件並聯構成。例如當該第一開關元件和該第二開關元件爲第一絕緣栅雙極型晶體管和第二絕緣栅雙極型晶體管時,該第一絕緣栅雙極型晶體管和該第二絕緣栅雙極型晶體管可爲多個絕緣栅雙極型晶體管並聯構成。As an implementation manner, when the power level of the inverter is relatively large, the first switching element and the second switching element of the bypass circuit 21 in the second embodiment and the third embodiment of the present invention may be configured to be connected in parallel by multiple switching elements. Composition. For example, when the first switching element and the second switching element are a first insulated gate bipolar transistor and a second insulated gate bipolar transistor, the first insulated gate bipolar transistor and the second insulated gate bipolar The transistor can be constructed in parallel with a plurality of insulated gate bipolar transistors.
本發明實施例的級聯型變頻器的功率單元的旁路電路21,在旁路電路21切上工作時,只有一條支路在工作,即每個時刻只有一條支路上的二極管和開關元件兩個功率器件導通,導通的器件少,損耗比較小,且本發明提供的旁路電路21結構比較簡單,可靠性高。而且,通過吸收電容C1和保護電阻(R1、R2)可進一步保護其旁路電路21的可靠性,進而提高級聯型變頻器的可靠性。而且,通過一個RC支路和一個旁路電路狀態檢測單元212可準確地檢測到旁路電路21的工作狀態。In the bypass circuit 21 of the power unit of the cascade type inverter of the embodiment of the present invention, when the bypass circuit 21 is cut, only one branch is working, that is, only one branch of the diode and the switching element at each moment. The power devices are turned on, the number of devices to be turned on is small, and the loss is relatively small, and the bypass circuit 21 provided by the present invention has a relatively simple structure and high reliability. Moreover, the reliability of the bypass circuit 21 can be further protected by the absorption capacitor C1 and the protection resistors (R1, R2), thereby improving the reliability of the cascade type inverter. Moreover, the operating state of the bypass circuit 21 can be accurately detected by an RC branch and a bypass circuit state detecting unit 212.
最後應當說明的是,很顯然,本領域的技術人員可以對本發明進行各種改動和變型而不脫離本發明的精神和範圍。這樣,倘若本發明的這些修改和變型屬於本發明申請專利範圍及其等同技術的範圍之內,則本發明也意圖包含這些改動和變型。It should be understood that various modifications and changes may be made thereto without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the invention,
1...主電路模組1. . . Main circuit module
11...熔斷器11. . . Fuse
12...整流器12. . . Rectifier
13...母線電容13. . . Bus capacitance
14...H逆變橋(逆變橋臂)14. . . H inverter bridge (inverter bridge arm)
2...旁路模組2. . . Bypass module
21...旁路電路twenty one. . . Bypass circuit
211...吸收電路211. . . Absorption circuit
212...旁路電路狀態檢測單元212. . . Bypass circuit state detection unit
22...旁路控制電路twenty two. . . Bypass control circuit
3...功率單元控制模組3. . . Power unit control module
31...控制電路31. . . Control circuit
32...故障檢測單元32. . . Fault detection unit
321...缺相檢測電路321. . . Phase loss detection circuit
322...橋臂故障檢測電路322. . . Bridge arm fault detection circuit
KM ...輔助開關K M . . . Auxiliary switch
T11...移相變壓器T11. . . Phase shifting transformer
A...第一輸出端A. . . First output
A1~A6...功率單元A1~A6. . . Power unit
B...第二輸出端B. . . Second output
B1~B6...功率單元B1~B6. . . Power unit
C1~C6...功率單元C1~C6. . . Power unit
C1...吸收電容C1. . . Absorption capacitor
C2...儲能電容C2. . . Storage capacitor
D1...第一二極管D1. . . First diode
D2...第二二極管D2. . . Second diode
Q1...第一絕緣柵雙極型晶體管Q1. . . First insulated gate bipolar transistor
Q2...第二絕緣柵雙極型晶體管Q2. . . Second insulated gate bipolar transistor
Q3...第三絕緣柵雙極型晶體管Q3. . . Third insulated gate bipolar transistor
Q4...第四絕緣柵雙極型晶體管Q4. . . Fourth insulated gate bipolar transistor
Q5...第五絕緣柵雙極型晶體管Q5. . . Fifth insulated gate bipolar transistor
Q6...第六絕緣柵雙極型晶體管Q6. . . Sixth insulated gate bipolar transistor
R1...第一保護電阻R1. . . First protection resistor
R2...第二保護電阻R2. . . Second protection resistor
R3...第三電阻R3. . . Third resistance
R4...第四電阻R4. . . Fourth resistor
圖1爲現有技術的一種接觸器式旁路電路的示意圖。1 is a schematic diagram of a prior art contactor bypass circuit.
圖2爲本發明的級聯型變頻器的結構示意圖。2 is a schematic structural view of a cascade type inverter of the present invention.
圖3爲本發明的功率單元的一種實施方式的示意圖。3 is a schematic diagram of an embodiment of a power unit of the present invention.
圖4爲本發明實功率單元的另一種實施方式示意圖。4 is a schematic diagram of another embodiment of a real power unit of the present invention.
圖5爲本發明旁路電路的一種實施方式的結構示意圖。FIG. 5 is a schematic structural view of an embodiment of a bypass circuit according to the present invention.
圖6爲本發明一種實施方式中主電路模組與旁路電路連接的示意圖。FIG. 6 is a schematic diagram of a main circuit module and a bypass circuit connected according to an embodiment of the present invention.
圖7爲本發明旁路電路的一種電流流向示意圖。FIG. 7 is a schematic diagram of current flow direction of the bypass circuit of the present invention.
圖8爲本發明旁路電路的另一種電流流向示意圖。FIG. 8 is a schematic diagram of another current flow direction of the bypass circuit of the present invention.
圖9爲本發明旁路電路的另一種實施方式的結構示意圖。FIG. 9 is a schematic structural view of another embodiment of a bypass circuit according to the present invention.
圖10爲本發明旁路電路的再一種實施方式的結構示意圖。FIG. 10 is a schematic structural view of still another embodiment of a bypass circuit according to the present invention.
圖11爲本發明旁路模組的一種實施方式的結構示意圖。11 is a schematic structural view of an embodiment of a bypass module of the present invention.
圖12爲本發明帶有吸收電容的旁路電路的結構示意圖。FIG. 12 is a schematic structural view of a bypass circuit with an absorbing capacitor according to the present invention.
圖13爲本發明另一種實施方式中主電路模組與旁路電路連接的示意圖。FIG. 13 is a schematic diagram of a connection between a main circuit module and a bypass circuit according to another embodiment of the present invention.
圖14爲本發明帶有吸收電容和第三電阻的旁路電路的結構示意圖。FIG. 14 is a schematic structural view of a bypass circuit with a snubber capacitor and a third resistor according to the present invention.
圖15爲本發明再一種實施方式中主電路模組與旁路電路連接的示意圖。FIG. 15 is a schematic diagram showing a connection between a main circuit module and a bypass circuit according to still another embodiment of the present invention.
1...主電路模組1. . . Main circuit module
21...旁路電路twenty one. . . Bypass circuit
A...第一輸出端A. . . First output
B...第二輸出端B. . . Second output
D1...第一二極管D1. . . First diode
D2...第二二極管D2. . . Second diode
Q1...第一絕緣柵雙極型晶體管Q1. . . First insulated gate bipolar transistor
Q2...第二絕緣柵雙極型晶體管Q2. . . Second insulated gate bipolar transistor
Q3...第三絕緣柵雙極型晶體管Q3. . . Third insulated gate bipolar transistor
Q4...第四絕緣柵雙極型晶體管Q4. . . Fourth insulated gate bipolar transistor
Q5...第五絕緣柵雙極型晶體管Q5. . . Fifth insulated gate bipolar transistor
Q6...第六絕緣柵雙極型晶體管Q6. . . Sixth insulated gate bipolar transistor
Claims (27)
該旁路電路包括一第一開關元件、一第二開關元件、一第一二極管和一第二二極管;
該旁路電路包括一第一橋臂和一第二橋臂,該第一橋臂包括一開關元件,該第二橋臂包括一二極管;
從該旁路電路的第一橋臂上引出一點作爲該旁路電路的第一輸入端,從該旁路電路的第二橋臂上引出一點作爲該旁路電路的第二輸入端,該第一輸入端和該主電路模組的第一輸出端電性連接,該第二輸入端和該主電路模組的第二輸出端電性連接;
當該主電路模組發生故障且旁路電路切上工作時,該旁路電路的一開關元件和一二極管導通以旁路相應的功率單元的主電路模組。A cascaded inverter power unit bypass module for bypassing a main circuit module of the power unit, the main circuit module comprising a fuse, a rectifier, a bus capacitor, and an H inverter bridge, from the H inverter Two points are drawn on the bridge as a first output end and a second output end of the main circuit module, and are characterized by comprising a bypass circuit;
The bypass circuit includes a first switching element, a second switching element, a first diode and a second diode;
The bypass circuit includes a first bridge arm and a second bridge arm, the first bridge arm includes a switching element, and the second bridge arm includes a diode;
Leading a point from the first bridge arm of the bypass circuit as a first input end of the bypass circuit, and extracting a point from the second bridge arm of the bypass circuit as a second input end of the bypass circuit, the first An input terminal is electrically connected to the first output end of the main circuit module, and the second input end is electrically connected to the second output end of the main circuit module;
When the main circuit module fails and the bypass circuit is cut, the switching element of the bypass circuit and a diode are turned on to bypass the main circuit module of the corresponding power unit.
該第一絕緣栅雙極型晶體管的發射極和該第二絕緣栅雙極型晶體管的集電極電性連接,該第一二極管的陽極和該第二二極管的陰極電性連接,該第一絕緣栅雙極型晶體管的集電極和該第一二極管的陰極電性連接,該第二絕緣栅雙極型晶體管的發射極和該第二二極管的陽極電性連接;
在該第一絕緣栅雙極型晶體管和該第二絕緣栅雙極型晶體管之間的一點引出一導線作爲該旁路電路的第一輸入端;
在該第一二極管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;
該第一二極管和第一絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第二絕緣栅雙極型晶體管組成第二條支路;
該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The cascading type inverter power unit bypass module according to claim 2, wherein the bypass circuit comprises the first insulated gate bipolar transistor and the second insulated gate bipolar transistor The first diode and the second diode;
The emitter of the first insulated gate bipolar transistor is electrically connected to the collector of the second insulated gate bipolar transistor, and the anode of the first diode and the cathode of the second diode are electrically connected. The collector of the first insulated gate bipolar transistor is electrically connected to the cathode of the first diode, and the emitter of the second insulated gate bipolar transistor is electrically connected to the anode of the second diode;
A wire is drawn at a point between the first insulated gate bipolar transistor and the second insulated gate bipolar transistor as a first input end of the bypass circuit;
A wire is drawn at a point between the first diode and the second diode as a second input of the bypass circuit;
The first diode and the first insulated gate bipolar transistor form a first branch, and the second diode and the second insulated gate bipolar transistor form a second branch;
The first output end of the main circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the main circuit module is electrically connected to the second input end of the bypass circuit.
該第一絕緣栅雙極型晶體管的集電極和該第二絕緣栅雙極型晶體管的發射極電性連接,該第一二極管的陰極和該第二二極管的陽極電性連接,該第一絕緣栅雙極型晶體管的發射極和該第一二極管的陽極電性連接,該第二絕緣栅雙極型晶體管的集電極和該第二二極管的陰極電性連接;
在該第一絕緣栅雙極型晶體管和該第二絕緣栅雙極型晶體管之間的一點引出一導線作爲該旁路電路的第一輸入端;
在該第一二極管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;
該第一二極管和第一絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第二絕緣栅雙極型晶體管組成第二條支路;
該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The cascading type inverter power unit bypass module according to claim 2, wherein the bypass circuit comprises the first insulated gate bipolar transistor and the second insulated gate bipolar transistor The first diode and the second diode;
The collector of the first insulated gate bipolar transistor is electrically connected to the emitter of the second insulated gate bipolar transistor, and the cathode of the first diode is electrically connected to the anode of the second diode. An emitter of the first insulated gate bipolar transistor is electrically connected to an anode of the first diode, and a collector of the second insulated gate bipolar transistor is electrically connected to a cathode of the second diode;
A wire is drawn at a point between the first insulated gate bipolar transistor and the second insulated gate bipolar transistor as a first input end of the bypass circuit;
A wire is drawn at a point between the first diode and the second diode as a second input of the bypass circuit;
The first diode and the first insulated gate bipolar transistor form a first branch, and the second diode and the second insulated gate bipolar transistor form a second branch;
The first output end of the main circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the main circuit module is electrically connected to the second input end of the bypass circuit.
該第一絕緣栅雙極型晶體管的發射極和該第一二極管的陽極電性連接,該第二絕緣栅雙極型晶體管的發射極和該第二二極管的陽極電性連接,該第一絕緣栅雙極型晶體管的集電極和該第二二極管的陰極電性連接,該第二絕緣栅雙極型晶體管的集電極和該第一二極管的陰極電性連接;
在該第一絕緣栅雙極型晶體管和該第一二極管之間的一點引出一導線作爲該旁路電路的第一輸入端;
在該第二絕緣栅雙極型晶體管和該第二二極管之間的一點引出一導線作爲該旁路電路的第二輸入端;
該第一二極管和第二絕緣栅雙極型晶體管組成第一條支路,該第二二極管和該第一絕緣栅雙極型晶體管組成第二條支路;
該主電路模組的第一輸出端電性連接該旁路電路的第一輸入端,該主電路模組的第二輸出端電性連接該旁路電路的第二輸入端。The cascading type inverter power unit bypass module according to claim 2, wherein the bypass circuit comprises the first insulated gate bipolar transistor and the second insulated gate bipolar transistor The first diode and the second diode;
The emitter of the first insulated gate bipolar transistor is electrically connected to the anode of the first diode, and the emitter of the second insulated gate bipolar transistor is electrically connected to the anode of the second diode. The collector of the first insulated gate bipolar transistor is electrically connected to the cathode of the second diode, and the collector of the second insulated gate bipolar transistor is electrically connected to the cathode of the first diode;
A wire is drawn at a point between the first insulated gate bipolar transistor and the first diode as a first input end of the bypass circuit;
A wire is drawn at a point between the second insulated gate bipolar transistor and the second diode as a second input end of the bypass circuit;
The first diode and the second insulated gate bipolar transistor form a first branch, and the second diode and the first insulated gate bipolar transistor form a second branch;
The first output end of the main circuit module is electrically connected to the first input end of the bypass circuit, and the second output end of the main circuit module is electrically connected to the second input end of the bypass circuit.
該吸收電容和該第三保護電阻串聯連接後,並聯於該旁路電路的兩端。The cascading type inverter power unit bypass module according to claim 12, wherein the absorbing circuit further comprises a third protection resistor;
The absorbing capacitor and the third protection resistor are connected in series and are connected in parallel to both ends of the bypass circuit.
該第一保護電阻的一端與該吸收電容的一端電性連接,該第一保護電阻的另一端與該母線電容一端電性連接;該第二保護電阻的一端與該吸收電容的另一端電性連接,該第二保護電阻的另一端與該母線電容的另一端電性連接。The cascading type inverter power unit bypass module according to claim 12, further comprising a first protection resistor and a second protection resistor;
One end of the first protection resistor is electrically connected to one end of the absorption capacitor, and the other end of the first protection resistor is electrically connected to one end of the bus capacitor; and one end of the second protection resistor is electrically connected to the other end of the absorption capacitor. The other end of the second protection resistor is electrically connected to the other end of the bus capacitor.
該RC支路包括第四電阻和儲能電容,該第四電阻和該儲能電容串聯連接後並聯在該旁路電路的兩端;
該旁路電路狀態檢測單元與該RC支路並聯,用於檢測該旁路電路是否工作。The cascading type inverter power unit bypass module according to claim 1, wherein the bypass circuit further comprises an RC branch and a bypass circuit state detecting unit;
The RC branch includes a fourth resistor and a storage capacitor, and the fourth resistor and the storage capacitor are connected in series and connected in parallel at both ends of the bypass circuit;
The bypass circuit state detecting unit is connected in parallel with the RC branch to detect whether the bypass circuit operates.
該主電路模組包括熔斷器、整流器、母線電容、H逆變橋,從該H逆變橋上引出兩點作爲該主電路模組的兩個輸出端;
該旁路模組爲如申請專利範圍第1項至第17項任一項所述的旁路模組;
該旁路電路的兩個輸入端與該主電路模組的兩個輸出端對接;
功率單元控制模組與該主電路模組和該旁路模組電性連接。A cascade type inverter power unit, comprising: a main circuit module, a power unit control module and a bypass module;
The main circuit module comprises a fuse, a rectifier, a bus capacitor, and an H inverter bridge, and two points are drawn from the H inverter bridge as two output ends of the main circuit module;
The bypass module is the bypass module according to any one of claims 1 to 17;
The two input ends of the bypass circuit are connected to the two output ends of the main circuit module;
The power unit control module is electrically connected to the main circuit module and the bypass module.
該故障檢測單元用於檢測該主電路模組是否故障;
該控制電路用於在故障檢測單元檢測出故障時,發送故障檢測信號。The cascading type inverter power unit according to claim 18, wherein the power unit control module comprises a control circuit and a fault detecting unit;
The fault detecting unit is configured to detect whether the main circuit module is faulty;
The control circuit is configured to send a fault detection signal when the fault detecting unit detects a fault.
該缺相檢測電路與經過該熔斷器的交流電源的三相輸入電性連接,用於檢測該主電路模組在交流輸入端是否發生故障;
該橋臂故障檢測電路與該H逆變橋電性連接,用於檢測該H逆變橋是否發生故障。The cascading type inverter power unit according to claim 19, wherein the fault detecting unit comprises a phase loss detecting circuit and/or a bridge arm fault detecting circuit;
The phase loss detecting circuit is electrically connected to the three-phase input of the AC power source passing through the fuse, and is configured to detect whether the main circuit module is faulty at the AC input end;
The bridge arm fault detecting circuit is electrically connected to the H inverter bridge, and is configured to detect whether the H inverter bridge is faulty.
該主電路模組包括熔斷器、整流器、母線電容、H逆變橋,從該H逆變橋上引出兩點作爲該主電路模組的兩個輸出端;
該旁路模組爲如申請專利範圍第1項至第17項任一項所述的旁路模組;
該旁路電路的兩個輸入端與該主電路模組的兩個輸出端對接;
功率單元控制模組與該主電路模組和該旁路模組電性連接。A cascade type frequency converter comprising a phase shifting transformer, a power unit and a three-phase load, wherein the power unit comprises a main circuit module, a bypass module and a power unit control module;
The main circuit module comprises a fuse, a rectifier, a bus capacitor, and an H inverter bridge, and two points are drawn from the H inverter bridge as two output ends of the main circuit module;
The bypass module is the bypass module according to any one of claims 1 to 17;
The two input ends of the bypass circuit are connected to the two output ends of the main circuit module;
The power unit control module is electrically connected to the main circuit module and the bypass module.
該故障檢測單元用於檢測該主電路模組是否故障;
該控制電路用於在故障檢測單元檢測出故障時,發送故障檢測信號。The cascading type inverter of claim 21, wherein the power unit control module comprises a control circuit and a fault detecting unit;
The fault detecting unit is configured to detect whether the main circuit module is faulty;
The control circuit is configured to send a fault detection signal when the fault detecting unit detects a fault.
該缺相檢測電路與經過該熔斷器的交流電源的三相輸入電性連接,用於檢測該主電路模組在交流輸入端是否發生故障;
該橋臂故障檢測電路與該H逆變橋電性連接,用於檢測該H逆變橋是否發生故障。The cascading type inverter of claim 24, wherein the fault detecting unit comprises a phase loss detecting circuit and/or a bridge arm fault detecting circuit;
The phase loss detecting circuit is electrically connected to the three-phase input of the AC power source passing through the fuse, and is configured to detect whether the main circuit module is faulty at the AC input end;
The bridge arm fault detecting circuit is electrically connected to the H inverter bridge, and is configured to detect whether the H inverter bridge is faulty.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011103577869A CN103107689A (en) | 2011-11-11 | 2011-11-11 | Cascading transducer and power unit and bypass module of power unit |
Publications (2)
Publication Number | Publication Date |
---|---|
TW201320566A TW201320566A (en) | 2013-05-16 |
TWI439024B true TWI439024B (en) | 2014-05-21 |
Family
ID=48280504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW101112024A TWI439024B (en) | 2011-11-11 | 2012-04-05 | Cascade frequency converter and power unit with bypass module thereof |
Country Status (3)
Country | Link |
---|---|
US (1) | US9025350B2 (en) |
CN (2) | CN103107689A (en) |
TW (1) | TWI439024B (en) |
Families Citing this family (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103078518A (en) * | 2011-10-26 | 2013-05-01 | 台达电子企业管理(上海)有限公司 | Heat dissipation device |
US9425705B2 (en) * | 2012-08-13 | 2016-08-23 | Rockwell Automation Technologies, Inc. | Method and apparatus for bypassing cascaded H-bridge (CHB) power cells and power sub cell for multilevel inverter |
US9007787B2 (en) | 2012-08-13 | 2015-04-14 | Rockwell Automation Technologies, Inc. | Method and apparatus for bypassing Cascaded H-Bridge (CHB) power cells and power sub cell for multilevel inverter |
US9876347B2 (en) * | 2012-08-30 | 2018-01-23 | Siemens Aktiengesellschaft | Apparatus and methods for restoring power cell functionality in multi-cell power supplies |
CN103795050B (en) * | 2012-10-31 | 2017-03-15 | 中兴通讯股份有限公司 | High tension protection circuit, high voltage protective method and power supply |
US20150318690A1 (en) * | 2012-12-10 | 2015-11-05 | Siemens Aktiengesellschaft | Submodule for limiting a surge current |
US9743473B2 (en) * | 2013-03-15 | 2017-08-22 | Lumenetix, Inc. | Cascade LED driver and control methods |
US9240731B2 (en) | 2013-03-18 | 2016-01-19 | Rockwell Automation Technologies, Inc. | Power cell bypass method and apparatus for multilevel inverter |
US9929774B2 (en) * | 2013-04-19 | 2018-03-27 | The Boeing Company | Methods and systems for vehicle communication to a data network |
US9876533B2 (en) | 2013-04-19 | 2018-01-23 | The Boeing Company | Methods and systems for vehicle communication to a data network |
CN103269155B (en) * | 2013-05-17 | 2016-12-28 | 深圳市禾望电气股份有限公司 | The discharge control method of the power cell of a kind of cascaded topology and system |
US9083230B2 (en) | 2013-06-20 | 2015-07-14 | Rockwell Automation Technologies, Inc. | Multilevel voltage source converters and systems |
CN103337950B (en) * | 2013-06-21 | 2015-10-21 | 华为技术有限公司 | Inverter protective circuit and apply its circuit arrangement |
EP2824701B1 (en) * | 2013-07-12 | 2020-05-06 | ABB Power Grids Switzerland AG | High-power semiconductor module |
CN103427601B (en) * | 2013-09-03 | 2015-11-18 | 山西科达自控股份有限公司 | Mining medium-high voltage frequency converter cooling back installation |
JP6070858B2 (en) * | 2013-10-24 | 2017-02-01 | 株式会社村田製作所 | Composite protective circuit, composite protective element and LED element for lighting |
KR101516497B1 (en) * | 2013-11-18 | 2015-05-04 | 엘에스산전 주식회사 | Method for detecting output phase open in inverter |
CN103701335A (en) * | 2013-12-31 | 2014-04-02 | 天安电气集团浙江电气有限公司 | High-voltage inverter power unit system |
US9520800B2 (en) | 2014-01-09 | 2016-12-13 | Rockwell Automation Technologies, Inc. | Multilevel converter systems and methods with reduced common mode voltage |
US9325252B2 (en) | 2014-01-13 | 2016-04-26 | Rockwell Automation Technologies, Inc. | Multilevel converter systems and sinusoidal pulse width modulation methods |
KR20150140966A (en) * | 2014-06-09 | 2015-12-17 | 엘에스산전 주식회사 | Cascaded H-bridge Inverter Capable of Operating in Bypass Mode |
US9871437B2 (en) * | 2014-07-10 | 2018-01-16 | University-Industry Foundation(UIF) | Fault current reduction structure of multi-level converter and apparatus using the fault current reduction structure |
CN104079154A (en) * | 2014-07-15 | 2014-10-01 | 北京利德华福电气技术有限公司 | Current-sharing bypass circuit of power unit of high-voltage inverter |
US9559541B2 (en) | 2015-01-15 | 2017-01-31 | Rockwell Automation Technologies, Inc. | Modular multilevel converter and charging circuit therefor |
US9748862B2 (en) | 2015-05-13 | 2017-08-29 | Rockwell Automation Technologies, Inc. | Sparse matrix multilevel actively clamped power converter |
JP6417042B2 (en) * | 2015-06-15 | 2018-10-31 | 東芝三菱電機産業システム株式会社 | Power converter |
CN108140858B (en) * | 2015-10-06 | 2021-10-26 | 康明斯发电Ip公司 | Reconfigurable converter |
CN105406457A (en) * | 2015-12-23 | 2016-03-16 | 辽宁荣信电气传动技术有限责任公司 | Two-circuit power supply high-voltage frequency converter unit bypass device based on thyristor |
US9812946B2 (en) | 2016-02-03 | 2017-11-07 | Delta Electronics, Inc. | Power converter and operating method thereof |
GB201610369D0 (en) * | 2016-06-15 | 2016-07-27 | Rolls Royce Plc | Control of an electrical converter |
EP3499704A4 (en) * | 2016-08-09 | 2020-04-29 | Hitachi Automotive Systems, Ltd. | Induced voltage suppression device, motor system, and power conversion system |
US9812990B1 (en) | 2016-09-26 | 2017-11-07 | Rockwell Automation Technologies, Inc. | Spare on demand power cells for modular multilevel power converter |
CN108347166B (en) * | 2017-01-24 | 2019-11-05 | 台达电子企业管理(上海)有限公司 | Power module train |
CN106712648A (en) * | 2017-03-08 | 2017-05-24 | 南通大学 | Online fault rapid detection and bypass protecting method for high-voltage variable-frequency speed control system |
CN106712647A (en) * | 2017-03-08 | 2017-05-24 | 南通大学 | High voltage variable frequency speed regulation system with on-line fault detection and bypass protection functions |
CN107086797A (en) * | 2017-05-04 | 2017-08-22 | 广州供电局有限公司 | Power model |
FR3074976B1 (en) * | 2017-12-12 | 2019-12-20 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | SWITCHED BATTERY |
US10158299B1 (en) | 2018-04-18 | 2018-12-18 | Rockwell Automation Technologies, Inc. | Common voltage reduction for active front end drives |
US10790738B1 (en) * | 2018-05-29 | 2020-09-29 | Haider Mhiesan | Circuit and method for fault detection and reconfiguration in cascaded H-bridge multilevel converters |
CN108809110A (en) * | 2018-06-13 | 2018-11-13 | 湖南图强科技开发有限公司 | A kind of power supply system of adjustable frequency |
CN109459628B (en) * | 2018-09-21 | 2021-03-12 | 科德数控股份有限公司 | Device for predicting failure of servo driver |
US11323435B2 (en) | 2019-05-08 | 2022-05-03 | The Boeing Company | Method and apparatus for advanced security systems over a power line connection |
CN110267391B (en) * | 2019-05-31 | 2023-02-14 | 厦门通士达照明有限公司 | LED polarity identification circuit and LED lamp with same |
CN112398322B (en) * | 2019-08-16 | 2022-09-23 | 南京南瑞继保电气有限公司 | Direct-series module, current conversion chain, current converter and control method |
US11211879B2 (en) | 2019-09-23 | 2021-12-28 | Rockwell Automation Technologies, Inc. | Capacitor size reduction and lifetime extension for cascaded H-bridge drives |
CN112583242B (en) * | 2019-09-29 | 2021-11-12 | 南京南瑞继保电气有限公司 | Redundant energy taking circuit of power module bypass switch and control method thereof |
CN112600399B (en) * | 2020-12-15 | 2022-01-04 | 国网湖北省电力有限公司电力科学研究院 | Cascaded H-bridge type medium-voltage UPS power unit bypass control method |
CN112865502B (en) * | 2020-12-31 | 2022-06-28 | 南京南瑞继保电气有限公司 | Automatic closing bypass protection device of series power module and control method |
US11342878B1 (en) | 2021-04-09 | 2022-05-24 | Rockwell Automation Technologies, Inc. | Regenerative medium voltage drive (Cascaded H Bridge) with reduced number of sensors |
CN115347805A (en) * | 2021-05-12 | 2022-11-15 | 台达电子企业管理(上海)有限公司 | Power supply device and control method thereof, three-phase power supply system and control method thereof |
CN113589127A (en) * | 2021-08-02 | 2021-11-02 | 科大国创新能科技有限公司 | Power tube fault detection method and cascade power tube fault detection method |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6014323A (en) * | 1997-08-08 | 2000-01-11 | Robicon Corporation | Multiphase power converter |
GB2330254B (en) * | 1997-10-09 | 2000-10-18 | Toshiba Kk | Multiple inverter system |
US5986909A (en) * | 1998-05-21 | 1999-11-16 | Robicon Corporation | Multiphase power supply with plural series connected cells and failed cell bypass |
CA2351175C (en) * | 1998-11-24 | 2016-05-03 | Niksun, Inc. | Apparatus and method for collecting and analyzing communications data |
US6697271B2 (en) * | 2000-08-16 | 2004-02-24 | Northrop Grumman Corporation | Cascaded multi-level H-bridge drive |
US7110272B2 (en) * | 2004-06-22 | 2006-09-19 | Smc Electrical Products, Inc. | Inverter bridge controller implementing short-circuit protection scheme |
US20050286274A1 (en) * | 2004-06-29 | 2005-12-29 | Hans-Erik Pfitzer | Self-testing power supply apparatus, methods and computer program products |
JP4760001B2 (en) * | 2004-12-09 | 2011-08-31 | ダイキン工業株式会社 | Multiphase current supply circuit, driving device, compressor, and air conditioner |
CN101299572A (en) * | 2008-05-23 | 2008-11-05 | 北京合康亿盛科技有限公司 | Pass-by apparatus for high voltage frequency transformer |
DE102009000328A1 (en) * | 2009-01-20 | 2010-07-22 | Semikron Elektronik Gmbh & Co. Kg | Battery charger and method of operation |
EP2369725B1 (en) * | 2010-03-25 | 2012-09-26 | ABB Schweiz AG | Short circuiting unit |
US8410638B2 (en) * | 2010-05-13 | 2013-04-02 | Eaton Corporation | Uninterruptible power supply systems and methods supporting load balancing |
CN101882863B (en) * | 2010-06-30 | 2012-11-21 | 上海发电设备成套设计研究院 | Unit bypass circuit of unit cascaded high-voltage frequency converter |
CN103066859A (en) * | 2011-10-19 | 2013-04-24 | 台达电子企业管理(上海)有限公司 | High-power high-voltage frequency inverter power unit |
-
2011
- 2011-11-11 CN CN2011103577869A patent/CN103107689A/en active Pending
- 2011-11-11 CN CN201510990943.8A patent/CN105610312A/en active Pending
-
2012
- 2012-04-05 TW TW101112024A patent/TWI439024B/en active
- 2012-09-27 US US13/628,961 patent/US9025350B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
US9025350B2 (en) | 2015-05-05 |
TW201320566A (en) | 2013-05-16 |
CN105610312A (en) | 2016-05-25 |
CN103107689A (en) | 2013-05-15 |
US20130121042A1 (en) | 2013-05-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI439024B (en) | Cascade frequency converter and power unit with bypass module thereof | |
RU2563034C2 (en) | High-voltage inverter | |
TWI441402B (en) | Power generation system and switch device thereof | |
WO2020228701A1 (en) | Photovoltaic inverter, and photovoltaic power generation system for same | |
WO2017024598A1 (en) | Mmc-hvdc system, and direct-current side isolation device and isolation method therefor | |
WO2015127716A1 (en) | Direct-current transmission protection apparatus, current converter, and protection method | |
US8971070B2 (en) | Interface arrangement between AC and DC systems for reliable opening of the circuit breaker in time | |
CN107769369B (en) | A kind of composite switch based on coupling negative pressure circuit | |
US20160308458A1 (en) | Power conversion device | |
WO2015081615A1 (en) | Direct-current circuit breaker | |
WO2020233180A1 (en) | Current-limiting controllable lightning arrester, converter, power transmission system, and control method | |
Cordeiro et al. | Fault-tolerant voltage-source-inverters for switched reluctance motor drives | |
WO2021017704A1 (en) | Inverter device and power supply system | |
WO2021243501A1 (en) | Fault protection apparatus | |
Lee et al. | Review on switching device fault, protection, and fault-tolerant topologies of current source inverter | |
CN106300309A (en) | A kind of flexible direct current electric network fault current limiter with fast restoration capabilities | |
CN111030493A (en) | Submodule of modular multilevel converter and protection circuit thereof | |
US20230421076A1 (en) | Fault-tolerant dc-ac electric power conversion device | |
CN116581720A (en) | Thyristor type direct current breaker and control method thereof | |
CN113659533B (en) | Parallel power converter system and energy storage system | |
CN111211541B (en) | Direct current solid-state circuit breaker | |
JP2014236306A (en) | Dc current interruption apparatus | |
CN203840234U (en) | Inverter having fault tolerance function | |
CN203674688U (en) | Unified electric energy quality controller protection system | |
JP2022136367A (en) | Dc current cut-off device |